.box{
    width:50%; margin-top:10%; margin:auto; padding:28px;
    height:550px; border:1px #111 solid;
    display:none;
}
.box.show{display:block;}
.box .x{ font-size:25px; color: #ffe9af;text-align:right; display:block;}
.box input{width:80%; font-size:18px; margin-top:18px;}